An employer may not fire an employee or change a condition of their employment because they are pregnant, or for taking maternity/parental leave under the BC Employment Standards Act.
Under section 13 of the BC Human Rights Code, an employer may not discriminate against you on the basis of “sex”, unless there is a bona fide occupational requirement which justifies the discrimination, or unless accommodating you would create undue hardship for the employer. Sex discrimination includes both discrimination on the basis of pregnancy, and failing to allow a woman to return to work at the conclusion of her maternity/parental leave.